I'm not sure if it's just me, but a lot of those alpine buildings look too clean and straight-forward for the TF2 style. I suggest adding some boarded up windows, maybe some random support planks etc.. just to give it a more rundown feel.
The ground is also a bit flat and open ( judging fromm ss_3), maybe add some more cover in props or displacement editing ?
Otherwise, it's looking great!
Tested on a 20 player server, Everyone thought that this map was intricate, unique, complicated, structurized nicely and overall awesome, however, everyone also agreed that this map is about the size of 2 football fields therefore rendering the map unplayable for arena standards, other than that, awesome map, probably for prophunt but not arena